Driver, Julia. 2006. Ethics: The Fundamentals. Vol. 1. Malden, Massachusetts: Blackwell Publishing. https://ebookcentral.proquest.com/lib/gla/detail.action?docID=1204064.
Grube, G. M. A. and Plato. 1992. The Republic. Edited by C. D. C. Reeve. Indianapolis, Indiana: Hackett Publishing Company. https://ebookcentral.proquest.com/lib/gla/detail.action?docID=735561.
Rowe, C. J., Sarah Broadie, and Aristotle. 2002. Nicomachean Ethics. Oxford: Oxford University Press.
Taylor, C. C. W. and Plato. 2002. Protagoras. Oxford: Oxford University Press.
